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Gold

American Gold Eagle bullion coins
American Gold Eagle proof coins
British Gold Britannia coins (from 2013)
British The Queen's Beasts (coin)
British gold Shēngxiào Lunar Series (British coin)
Canadian Gold Maple Leaf coins
Austrian Gold Philharmonic coins
Australian Kangaroo/Nugget coins
Chinese Gold Panda coins
American Gold Buffalo uncirculated coins (proofs not allowed)
Gold bars and rounds produced by a NYMEX or COMEX-approved refinery or national government mint, meeting minimum fineness requirements

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Silver

American Silver Eagle bullion coins
American Silver Eagle proof coins
British Silver Britannia coins (from 2013)
British The Queen's Beasts (coin)
British silver Shēngxiào Lunar Series (British coin)
Canadian Silver Maple Leaf coins
Austrian Silver Philharmonic coins
Australian Silver Kookaburra coins
Chinese Silver Panda coins
Mexican Libertad coins
Silver bars and rounds produced by a NYMEX or COMEX-approved refinery or national government mint, meeting minimum fineness requirements

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Platinum

American Platinum Eagle coins
American Platinum Eagle proof coins
British The Queen's Beasts (coin)
Canadian Platinum Maple Leaf coins
Isle of Man Noble coins